Spinning cot



s- 2 E. L. LuAcEs 2,426,227

SPINNING COT I Filed July :51, 1944 III/I/I/III:

' mvEgqToR .Fumqus I. L unccs.

BY M PM.

A'ITORNEYS UNITED s'raras PATENT, OFFICE 2,426,227 I srnmmc cor Enrique L. Luaces, Dayton, Ohio, assignor to The Dayton Rubber Manufacturing Company, Dayton, Ohio, a corporation of Ohio Application July 31, 1944, Serial No. 547,429

3 Claims. (01. 19-143) This invention relates to textile machine units, corporated therein. The fibrous material ll may and more particularly to cots for spinning rolls. be advantageously ground or shredded cellulose In the past, textile cots were made of leather. material, more particularly cellulose sponge. However, leather cots proved unsatisfactory for The cots of this invention are made by methuse on modern machines which work at relatively 5 ods common to the art, using any kind of a cot high speeds, since, due to the smoothness of their material of the desired properties but having surface, they did not provide sufllcient gripping fibrous material such as ground or shredded celaction. The consequence of this lack of gripping lulose sponge substantially uniformly distributed action is a phenomenon which, in the art, is therethrough, When such cots are used in the called eyebrowing. Eyebrowing occurs if the roll sp p c the frictional effect between the covers are too smooth and the grippage insufcot and the fibers being drafted causes the ends flcient to pull the short fibers back under the of the fibrous particles at the working surface clearer boards. In such a case the lint fibers .of the cot to break off. In substantially all cases amass along the from; of the out t a sci-called the fibrous particles fall off while still at some curtain and are loosened there by the overhead l5 distance below the surface, and thus le v Pi s cleaners and taken into the yarn where they form or cavities It in the surface which ive to th slugs. Only after lon use did leather cots becot a ro gh ned surface. One f h advantages come rough enough to be free from eyebrowing; of the cots made according to this invention is however, by then the cots had lost the greatest that as the surface of the cot wears down, new part of their strength, and soon after this they fibrous particles appear at the surface and are had to be replaced by new leather cots. brok n r fall away n th sam way n which More recently use has been made of cots made the origin l fibrous Partlcles at the Surface of of synthetic materials which show a considerthe new cot were broken and fell off, th nably longer lifetime than leather cots. However, tinuously forming new cavities and maintaining these synthetic cots, unless made from selected the roughness of he cotmaterials and properly processed, have the draw- The particles, inasmuch as y are cellulose back of eyebrowing even to a greater degree than pon e. h have a senes f c lls which as the new leather cots. presented to the work increase the gripping ac- Th principal bj t of th present invention tion of the cot. This occurs before the cot has is to provide a spinning out with a rough ram been worn down to the point where particles face the production of which does not require fall off to form new cavities in the places where a special step in manufacture, but which is inthe particles were located. It will be understood herently formed in manufacture and remains durthat the particles do 'not fall out until the cot is ing the life of the cot. Such a cot exhibits good worn down and that during this time the partidraftlng qualities, produces yarns of uniform apcles present a series of cells to the work thereby pearance and strength, possesses good durabilincreasing the gripping action of the cot. ity, and does not cause eyebrowing. Synthetic rubbers and also other synthetics of The spinning cot of the present invention has the desired qualities may be used as the basic 9. roughened surface caused by a. plurality of ingredient of the cot material. It has been found cavities distributed all over the working surface 0 that the Perbunans, which are acrylic nitrile and which continuously form with the same speed as I butadiene copolymers give the most satisfactory the surface wears ofl'. results. As fibrous materials, ground or shredded The invention will be more fully understood cellulose sponge proves eminently satisfactory. from the following description taken in connec- A quantity of from 30 to 70% of cellulose sponge tion with the accompanying drawing, in which: with regard to the weight of the cot body was Fig. 1 represents a spinning roll covered with '9. found to be the preferred range. cot; and Cots made as described above are of improved Fig. 2 represents an enlarged portion of the cot durability, their efllciency not being impaired by body showing its pockmarked surface and ad-. the length of their use. They produce yarns of mixed material thoroughly distributed throughto uniform appearance from the beginning to the out the body thereof. endof their service life, and do not cause eye- In Fig. 1, Ill represents a spinning roll, and II browing. I is a cot mounted thereon. Two theories might help to explain the in- As shown in Fig. 2, the cot bod I2 is made of creased efliciency of cots made according to'the rubber composition having fibrous material It in- 5 invention. One is that the cavities may act as non-eyebrowing characteristics, said cot low static build-up.

suction cups and thus increase the gripping ac-, tion of the cot. The other is that the static electricity, which is usually generated byrubber articles subjected to friction, is continuously discharged from the many edges and corners of the cavities forming the rough character of the cot surface. It also may be that a, coaction of these two or even other unknown phenomena is present. These theories are only of explanatory character, and are not intended to limit the scope of the invention.

It will be understood that While there have been described herein certain specific embodiments of this invention, it is not intended thereby to have the invention limited to or circumscribed by the specific details of procedure, materlals, arrangement of parts, and conditions set forth in the specification or illustrated in the drawing, in view of the fact that this invention may be modified according to individual preference and conditions without departing from the spirit of this disclosure and the scope of the appended claims.

I claim:

1. As a new article of manufacture, a spinning cot comprising a body of acrylic nitrile and butadiene-copoiymers having dispersed therethrough particles of cellulose sponge in spaced independent bodies incorporated in the copolymer materials, said bodies representing from 30 to 70% of the spinning cot, said cellulose sponge particles each havingcavlties dispersed through their bodies whereby to present a series of cavities to the work, said bodies being adjacent the surface of said cot and adapted to fall oil as the said surface wears off in use, whereby continuously to maintain a roughened surface exhibiting high grippage and 2. As a new article of manufacture, a spinning cot comprising a non-porous body of acrylic nitrile and butadiene copolymers having dispersed therethrough particles of cellulose sponge in spaced independent bodies incorporated in the copolymer materials, said bodies representing from 30 to of the spinning cot, said cellulose sponge particles each having cavities dispersed through their bodies whereby to present a series of cavities to the work, said bodies being adjacent the surface of said cot and adapted to fall of! as the said surface wears oil! in use, whereby continuously to maintain a roughened surface exhibiting high grippage and non eyebrowing characteristics, said cot having a low static build-up.

3. As a new article of manufacture, a, spinning cot comprising a non-porous non-perforated body of acrylic nitrile and butadiene copolymers having dispersed therethrough particles of cellulose sponge in Spaced independent bodies incorporated in the copolymer materials, said bodies representing' from 30 to 70% of the spinning cot, said cellulose sponge particles each having cavities dispersed through their bodies whereby to present a series ofcavities to the work, said bodies bein adjacent the surface of said cot and adapted to fall off as the said surface wears ofl in use, whereby continuously to maintain a roughened surface exhibiting high grippage and non-eyebrowing characteristics, said cot having a low static build- E. L. LUAcEs.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,988,491 Hazell- Jan. 22, 1935 2,332,514 Holtzclaw Oct. 26, 1943 938,087 Subers Oct. 26, 1909 2,012,223 Cutler Aug. 20, 1935 2,304,656 Rockofi Dec. 8, 1942 2,119,491 Rapport May 31, 1938 2,386,583 H. M. Bacon Oct. 9, 1945 2,393,953 H. M. Bacon 1 Feb. 5, 1946 

